If you upload a file to the dnn using its internal file upload tools and whenever you run a synchronize on the dnn file manager -  dnn creates an internal file store reference to each individual file.

The linkclick id's are simply records pointing to the internal file store references.

To locate a folder in the file store - all relative to the user portal for example based on an absolution path for portal 0 - c:\website\Portals\0\

to find the fileid of a file in c:\website\Portals\0\somefolder\somefile.txt

String thisFileStr = "somefile.txt";
String thisFolderStr "\somefolder\";

IFolderInfo thisfolder = FolderManager.Instance.GetFolder(PortalId,thisFolderStr);

FileInfo thisFile = FileManager.Instance.GetFile(thisfolder ,thisFileStr);

Int32 thisFileId = thisFILE001.FileId;

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